"This reminds me so much of the WMF attacks earlier this year," said Roger Thompson, chief technology officer at Exploit Prevention Labs, in Atlanta. "It came out of left field, ran undetected for a week or three, and by the time the official, emergency patch came out, the damage was done."

"In eight days, the bad guys replenished their botnets, made their money and moved on to the next zero-day. Now the industry is struggling to clean up and chase the copycats," Thompson said.

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